package jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

/**
 * 执行UPDATE语句
 */
public class JDBCDemo4 {
    public static void main(String[] args) throws Exception {
        //需求:将id为1的用户昵称改为"小张"
        Class.forName("com.mysql.cj.jdbc.Driver");
        Connection connection = DriverManager.getConnection(
                "jdbc:mysql://localhost:3307/tedu?characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai&rewriteBatchedStatements=true",
                "root",
                "root");
        System.out.println("与数据库链接成功!");
        Statement statement = connection.createStatement();
        /*
            UPDATE userinfo
            SET nickname='小张'
            WHERE id=1
         */
        String sql = "UPDATE userinfo " +
                     "SET nickname='小张' " +
                     "WHERE id=1";
        int num = statement.executeUpdate(sql);
        System.out.println(num>0?"修改成功":"修改失败");
        connection.close();
    }
}
